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Analog Devices Inc. LTC2408IG#PBF
- Part No.:
- LTC2408IG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC2408IG#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,061
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Product details
Overview
LTC2408IG#PBF from Analog Devices (formerly Linear Technology) is an 8-channel, 24-bit micropower delta-sigma ADC with no-latency digital filtering, integrated oscillator, 4ppm INL, 0.3ppm RMS noise, and single-supply operation from 2.7V to 5.5V. It resolves analog inputs from –12.5% VREF to 112.5% VREF and delivers valid first-conversion results after channel change-enabling high-accuracy multiplexed sensing in weight scales and industrial process control.
For engineers reviewing the LTC2408IG#PBF datasheet, LTC2408IG#PBF pinout, LTC2408IG#PBF application, or LTC2408IG#PBF equivalent, key selection criteria include its 110dB 50/60Hz notch rejection, SPI/MICROWIRE-compatible 4-wire interface, internal oscillator eliminating external timing components, extended input range accommodating sensor overrange, and guaranteed no missing codes across full temperature range.
Technical Context
The LTC2408IG#PBF implements a decimating FIR filter synchronized to an on-chip oscillator or user-provided external clock (1Hz–120Hz), enabling precise 50Hz/60Hz ±2% line-frequency rejection without external components. Its auto-calibrating architecture performs offset and full-scale correction every conversion cycle, ensuring stability against supply and temperature drift.
It integrates an 8-channel analog multiplexer with break-before-make switching (290ns), 120Ω–300Ω on-resistance, and ±20nA leakage current. The serial interface supports two SCK modes: internal (19.2kHz output) or external (up to 2MHz), with CSADC-controlled data output timing and real-time EOC signaling via SDO bit-31.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guarantees monotonicity and full dynamic range utilization. |
| INL | 4ppm max at VREF = 5V-enables 16-bit+ effective linearity for precision instrumentation. |
| RMS Noise | 0.3ppm of VREF-translates to ~1.5µV RMS at 5V reference, supporting sub-µV signal resolution. |
| Power Supply | 2.7V to 5.5V single supply-simplifies power design in battery-powered or mixed-voltage systems. |
| Supply Current | 200µA typical in conversion mode, 20µA in sleep-extends battery life in portable data acquisition. |
| Input Range | –0.125 × VREF to 1.125 × VREF-accommodates 12.5% sensor overrange and underrange without clipping. |
| Notch Rejection | ≥110dB at 50Hz or 60Hz ±2%-eliminates mains interference in industrial environments without external filters. |
Pinout & Package
Package: 28-lead plastic SSOP (G package), 5.6mm × 10.2mm, 0.635mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,5,6,16,18,22,27,28) | Ground reference | Multiple low-inductance ground connections required for noise immunity and thermal stability. |
| VCC (Pins 2,8) | Positive supply | 2.7V–5.5V input; requires local 10µF tantalum + 0.1µF ceramic bypassing. |
| VREF (Pin 3) | Reference voltage input | Accepts 0.1V to VCC; sets full-scale range and noise floor scaling. |
| ADCIN (Pin 4) | Analog input node | Connects to MUXOUT for standard operation; accepts extended-range signals. |
| MUXOUT (Pin 7) | Multiplexer output | Drives ADCIN; must be tied directly for normal 8-channel conversion. |
| CH0–CH7 (Pins 9–14,15,17) | Analog channel inputs | Eight differential-capable inputs; CH4–CH7 are no-connect on LTC2404 only. |
| FO (Pin 26) | Filter oscillator control | Selects 50Hz (FO=VCC), 60Hz (FO=GND), or user-defined notch (FO=external clock). |
| SCK (Pin 25) | Serial clock output/input | Configurable as internal 19.2kHz clock source or external clock sync input. |
| SDO (Pin 24) | 3-state serial data output | Provides 32-bit frame with EOC flag (bit 31); high-Z when CSADC=high. |
| CSADC (Pin 23) | ADC chip select | Active-low enables data output and initiates new conversion on rising edge. |
| CSMUX (Pin 20) | MUX chip select | Active-low enables channel selection via DIN; driven in parallel with CSADC. |
| DIN (Pin 21) | Channel address input | 4-bit serial address loaded on CLK rising edges before CSMUX goes low. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency digital filter | Single-cycle settling eliminates dead time between channel changes-valid first sample enables true multiplexed scanning. |
| Integrated oscillator | Eliminates crystals, capacitors, or external clocks-reduces BOM count and layout area while guaranteeing 50/60Hz rejection accuracy. |
| Extended input range | –12.5% to +112.5% of VREF accommodates amplifier offset, gain error, and transient overvoltage without saturation or recalibration. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction ensures long-term stability across temperature, supply variation, and aging-no system-level calibration needed. |
| SPI/MICROWIRE compatibility | 4-wire interface (CSADC, SCK, SDO, DIN) works with standard microcontroller peripherals-no custom driver logic required. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing systems requiring 1:1,000,000 dynamic range and NTEP compliance. IC Role / Device Role / Timing Role: 24-bit ADC digitizing mV-level bridge outputs with live-zero capability to handle tare offsets and mechanical overloads. Use Value: 4ppm INL and 0.3ppm noise enable <10µg resolution at 10kg full scale; 110dB line rejection prevents AC-induced drift in unshielded factory floors. | Use Scenario: Precision RTD or thermistor measurement in HVAC controllers, medical devices, and environmental monitoring nodes. IC Role / Device Role / Timing Role: 8-channel front-end converting conditioned sensor voltages with programmable 50/60Hz notch to suppress ambient EMI. Use Value: Extended input range absorbs amplifier DC offset; per-conversion calibration maintains ±0.01°C accuracy over –40°C to +85°C without firmware compensation. |
| Gas Analyzers | Strain Gauge Transducers |
Use Scenario: Electrochemical or NDIR gas sensor signal conditioning where ppm-level concentration detection demands ultra-low noise and long-term baseline stability. IC Role / Device Role / Timing Role: Low-power, high-precision ADC capturing slow-varying sensor currents/voltages with automatic zero/full-scale correction. Use Value: 200µA operating current extends battery life in portable analyzers; 0.3ppm RMS noise resolves sub-nA current changes in electrochemical cells. | Use Scenario: Structural health monitoring using arrays of bonded strain gauges in bridges, aircraft, or industrial machinery. IC Role / Device Role / Timing Role: Multiplexed 24-bit digitization of quarter/half/full-bridge outputs with simultaneous channel switching and valid first-sample assurance. Use Value: No-latency filtering enables rapid scan of 8 gauge locations per second; 120Ω mux on-resistance minimizes gain error in ratiometric measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 24-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1248IPWR | 24-bit, 2kSPS, integrated PGA and reference; requires external crystal; 1.8V–5.25V supply. | Higher speed and on-chip gain support active sensor interfaces; less suitable for ultra-low-power battery operation. | Choose ADS1248IPWR when PGA, higher throughput, or integrated reference are needed; LTC2408IG#PBF preferred for lowest power and simplest timing. |
| MAX11206ETL+ | 24-bit, 10SPS, internal oscillator, 110dB 50/60Hz rejection; 2.7V–3.6V supply only; 20-pin TQFN. | Narrower supply range and smaller package limit use in 5V industrial systems; lower pin count reduces routing complexity. | Choose MAX11206ETL+ for space-constrained 3.3V designs; LTC2408IG#PBF offers 8-channel flexibility and 5.5V tolerance for legacy industrial rails. |
Compared with ADS1248IPWR and MAX11206ETL+, the LTC2408IG#PBF uniquely combines 8-channel multiplexing, true no-latency operation, and 2.7V–5.5V supply in a single SSOP package-making it optimal for cost-sensitive, low-power, multi-sensor industrial DAQ where timing simplicity and extended input range are critical.
Availability
LTC2408IG#PBF is available at Aetrix Electronics and suitable for weight scales, direct temperature measurement, gas analyzers, and strain gauge transducer systems requiring stable component supply, long-term manufacturability, and guaranteed performance across –40°C to +85°C.
Supply support for LTC2408IG#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2408IG#PBF belongs to ADI's legacy Linear Technology precision ADC product line, designed specifically for low-power, high-accuracy, multiplexed sensor measurement in harsh industrial environments where reliability, noise immunity, and ease of integration are paramount.
FAQ
What is the operating temperature range for the LTC2408IG#PBF?
The LTC2408IG#PBF is specified for operation from –40°C to +85°C (Industrial grade). This range is confirmed in the "Operating Temperature Range" section of the datasheet and applies to all electrical specifications unless otherwise noted. The "I" suffix in LTC2408IG#PBF explicitly denotes this industrial temperature grade, distinguishing it from the commercial-grade "C" version (0°C to 70°C).
Does the LTC2408IG#PBF require external timing components for 50Hz/60Hz rejection?
No, the LTC2408IG#PBF does not require external timing components. Its integrated oscillator provides precise 50Hz or 60Hz notch filtering when the FO pin is tied to VCC or GND respectively. This eliminates crystals, RC networks, or external clock sources-reducing BOM cost and layout sensitivity while guaranteeing ≥110dB rejection at line frequency ±2%.
How many analog input channels does the LTC2408IG#PBF support?
The LTC2408IG#PBF supports eight analog input channels (CH0 through CH7), as confirmed by the part number suffix "08" and the pinout diagram showing dedicated pins for CH4–CH7. This distinguishes it from the 4-channel LTC2404 variant. All eight channels are functional and accessible in the 28-lead SSOP package of the LTC2408IG#PBF.
What is the meaning of "no latency" in the LTC2408IG#PBF specification?
"No latency" means the LTC2408IG#PBF's digital filter settles in a single conversion cycle. Unlike conventional delta-sigma ADCs requiring multiple dummy conversions after channel change, the first valid result from the LTC2408IG#PBF corresponds precisely to the newly selected input channel-enabling deterministic, jitter-free multiplexed sampling without software overhead or timing uncertainty.
Can the LTC2408IG#PBF operate with a 3.3V supply and 2.5V reference?
Yes, the LTC2408IG#PBF fully supports 3.3V supply and 2.5V reference. Its supply range (2.7V–5.5V) and reference range (0.1V–VCC) explicitly include this combination. Performance data-including 4ppm INL, 0.5ppm offset, and 110dB rejection-is verified at VCC = 3.3V and VREF = 2.5V in the datasheet's "Converter Characteristics" table.
LTC2408IG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2408IG#PBF FAQ
1.How can I place an order for LTC2408IG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2408IG#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2408IG#PBF reliable?
The price and inventory of LTC2408IG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2408IG#PBF is usually 5 days.
3.What payment methods are accepted for LTC2408IG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2408IG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2408IG#PBF?
LTC2408IG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2408IG#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2408IG#PBF?
For technical support, including LTC2408IG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2408IG#PBF requirements.
6.How does Aetrix verify that LTC2408IG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2408IG#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2408IG#PBF meets industry standards.
7.What is the process for return or replacement of LTC2408IG#PBF?
All LTC2408IG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2408IG#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2408IG#PBF part is unused and in its original packaging.
Return procedure for LTC2408IG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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